On Sun, 17 Jun 2007, Bruce Momjian wrote:
I have completed my first pass over the tsearch documentation:
http://momjian.us/expire/fulltext/HTML/sql.html
They are from section 14 and following.
I have come up with a number of questions that I placed in SGML comments
in these files:
http://momjian.us/expire/fulltext/SGML/
Teodor/Oleg, let me know when you want to go over my questions.
Below are my answers (marked as )
Comments to editorial work of Bruce Momjian.
fulltext-intro.sgml:
it is useful to have a predefined list of lexemes.
Bruce, here should be list of types of lexemes !
</para></listitem>
<!--
SEEMS UNNECESSARY
It useless to attempt normalize <type>email address</type> using
morphological dictionary of russian language, but looks reasonable to pick
out <type>domain name</type> and be able to search for <type>domain
name</type>.
-->
I dont' understand where did you get this para :)
fulltext-opfunc.sgml:
All of the following functions that accept a configuration argument can
use either an integer <!-- why an integer --> or a textual configuration
name to select a configuration.
originally it was integer id, probably better use <type>oid</type>
This returns the query used for searching an index. It can be used to test
for an empty query. The <command>SELECT</> below returns <literal>'T'</>,
<!-- lowercase? --> which corresponds to an empty query since GIN indexes
do not support negate queries (a full index scan is inefficient):
capital case. This looks cumbersome, probably querytree() should
just return NULL.
The integer option controls several behaviors which is done using bit-wise
fields and <literal>|</literal> (for example, <literal>2|4</literal>):
<!-- why so complex? -->
to avoid 2 arguments
its <replaceable>id</replaceable> or <replaceable>ts_name</replaceable>; <!-- n
if none is specified that the current configuration is used.
I don't understand this question
<para>
<!-- why? -->
Note that the cascade dropping of the <function>headline</function> function
cause dropping of the <literal>parser</literal> used in fulltext configuration
<replaceable>tsname</replaceable>.
</para>
hmm, probably it should be reversed - cascade dropping of the parser cause
dropping of the headline function.
In example below, <literal>fulltext_idx</literal> is
a GIN index:<!-- why isn't this automatic -->
It's explained above. The problem is that current index api doesn't allow
to say if search was lossy or exact, so to preserve performance of
GIN index we had to introduce @@@ operator, which is the same as @@, but
lossy.
nly the <token>lword</token> lexeme, then a <acronym>TZ</acronym>
definition like ' one 1:11' will not work since lexeme type
<token>digit</token> is not assigned to the <acronym>TZ</acronym>.
<!-- what do these numbers mean? -->
</para>
nothing special, just numbers for example.
<function>ts_debug</> displays information about every token of
<replaceable class="PARAMETER">document</replaceable> as produced by the
parser and processed by the configured dictionaries using the configuration
specified by <replaceable class="PARAMETER">cfgname</replaceable> or
<replaceable class="PARAMETER">oid</replaceable>. <!-- no need for oid
don't understand this comment. ts_debug accepts cfgname or its oid
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: [EMAIL PROTECTED], http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
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